Sci-Hub
Offers direct access to over 64.5 million academic papers by bypassing paywalls using institutional proxies.
Z-Library
A large repository of books and articles, with user-contributed content, aiming to be the world's largest e-book and scientific paper library.
Library Genesis
Aggregates scientific, technical, and academic content, offering links to third-party resources.
Unpaywall
Harvests open-access content from numerous publishers and repositories, providing easy access to free versions of research papers.
GetTheResearch.org
An AI-powered search engine for free scholarly articles, part of the Unpaywall project.
Directory of Open Access Journals (DOAJ)
Indexes nearly 17,500 open-access journals across various disciplines.
Researcher
A mobile app that provides daily updates on new journal papers relevant to your research.
ScienceOpen
A discovery platform offering advanced search, post-publication peer review, and social sharing features.
OA.mg
A search engine for academic papers, helping users find specific papers or research from various fields.
Internet Archive Scholar
A full-text search index with over 25 million research articles and scholarly documents preserved in the Internet Archive.
Citationsy Archives
A citation management tool with a clean interface and a focus on usability.
CORE
The world’s largest aggregator of open-access research papers from repositories and journals.
Dimensions
A comprehensive research database linking publications to grants, datasets, clinical trials, and patents.
PaperPanda
A Chrome extension that searches for free PDFs of research papers by querying various open-access repositories.